Mr & Mrs Jones 17.1.1790 at Mrs Webb's / 20.4.1790 again / 25.12.1791 again / 18.12.1791 call on Mrs Jones / 18.10.1792 write to Mr Jones
This first set of Jones entries in Godwin's diary all seem to refer to one couple, friends of the Webbs. They may just possibly be Arthur Jones (died 1794) linen draper of Bath and his wife, whose daughters appear often later in the diary (see Jones, Louisa & Jones, Margaret). The Webbs were Bristol merchants trading to the West Indies.
Another possibility is William and Margaret Jones of Pall Mall parents of WJAdair (see Adair, William Jones)